Quantum correlations at negative absolute temperatures

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We study behavior of quantum discord, a kind of quantum correlation, in systems of dipole–dipole interacting spins in an external magnetic field in the whole temperature range (-∞ < T < ∞). It was shown that negative temperatures, which are introduced to describe inversions in the population in a finite level system, provide more favorable conditions for emergence of quantum correlations including entanglement. We show that at negative temperature, the correlations become more intense and discord exists between remote spins being in separated states.

Original languageEnglish
Pages (from-to)2759-2768
Number of pages10
JournalQuantum Information Processing
Issue number12
StatePublished - 15 Nov 2014


  • Discord
  • Entanglement
  • Negative absolute temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Theoretical Computer Science
  • Signal Processing
  • Modeling and Simulation
  • Electrical and Electronic Engineering


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